bird behaviour, SWIFT DIARY 2012Swift lays second egg May 30, 2012May 30, 2012 jonathanpomroy Female swift with eggs- 30th May Female Swift incubating eggs- 30th May. Copyright Jonathan Pomroy 2012 Both birds have started incubating the two eggs the first of which should hatch in about 19 days. Related Published by jonathanpomroy View all posts by jonathanpomroy